整式的乘除（講義）課前預(yù)習(xí)整式的分類(lèi)：定義：數(shù)字與字母的乘積構(gòu)成的代數(shù)式單項(xiàng)式系數(shù)：?jiǎn)雾?xiàng)式前面的_________次數(shù)：全部字母的________整式定義：幾個(gè)單項(xiàng)式的和_______項(xiàng)：構(gòu)成多項(xiàng)式的每個(gè)單項(xiàng)式次數(shù)：___________項(xiàng)的次數(shù)2.叫做同類(lèi)項(xiàng)；把同類(lèi)項(xiàng)合并成一項(xiàng)叫做合并同類(lèi)項(xiàng)；合并同類(lèi)項(xiàng)時(shí)，．乘法分派律：a(bc)_______________．類(lèi)比遷徙：老師出了一道題，讓學(xué)生計(jì)算x5yx2．小聰是這么做的：x5yx2x5yxxxxxyx3yx2xx請(qǐng)你類(lèi)比小聰?shù)淖龇ㄓ?jì)算：8m2n22m2n．知識(shí)點(diǎn)睛單×單：_______乘以________，_________乘以________．單×多：依據(jù)________________，轉(zhuǎn)變?yōu)閱巍羻危唷炼啵何帐衷瓌t．單÷單：系數(shù)除以系數(shù)，字母除以字母．多÷單：借用乘法分派律．精講精練1.①■4xy2xy3z_______；②3x2y(2x32)_______；“■”在不惹起歧義的狀況y下，單項(xiàng)式和其余單項(xiàng)式或1x2y③(4y3)______；多項(xiàng)式運(yùn)算時(shí)，自己能夠不2加括號(hào)．④(3a3)2(2a2)；⑤2x3(2xy)(2xy)3．2.①2ab(5ab23a2b)______________________；②2ab2c2ab1ab____________________；32③(2a)1a31_________________；4④(x22y)(xy2)2；⑤2(xy2z3x2)x2y．計(jì)算：①(3x4y)(3x4y)；②(mn)(3m2n1)；③(2mn)(3m2n)；④(2xy)2；⑤(abc)(abc)．計(jì)算：①5x6x(13xx2)；②10x2(2x3)(4x2)．5.①a2b2c1ab_____；②(3m3n5)(0.5m3n2)______；2③(2xy)6(xy)2______；④(2a2b)2(_______)2a；⑤8(ab)44(ab)3___________；3⑥(2x2y)3(7xy2)14x4y3．6.①(4x56x3)(2x2)_____________；②3x2yxy21xy1xy_______________；22③2ab24a3b46a4b31ab2___________________；33(a2b3a2b2)(2ab)2_____________；(m4n32m5n2)(mn)2________________；⑥(___________